Denial of Service Vulnerability in Helm Product by Helm Project
CVE-2026-63308

5.3MEDIUM

Key Information:

Vendor

Helm

Status
Helm
Vendor
CVE Published:
17 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-63308?

Helm versions up to 4.2.3 contain a vulnerability in the Files.Lines template helper that can lead to a denial of service. An attacker can exploit this flaw by including zero-length byte slices in chart files, causing the Helm engine to panic and resulting in deterministic render failures. This issue affects various operations including template rendering, installs, upgrades, and linting processes within Helm. Users should take immediate action by updating to the patched version to ensure their deployments remain secure.

Affected Version(s)

helm 0 <= 4.2.3

helm ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-63308 - Proof of Concept

References

https://github.com/helm/helm/issues/32279
technical-descriptionexploit
https://github.com/helm/helm/pull/32290
issue-tracking
https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad...
patch

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.